Fix crash when accessing the content model.

1) Make sure invalidateContents() is called whenever the help engine's
   DB readers are destroyed.
2) In QHelpContentProvider::stopCollecting(), remove all root items, as
   they are invalid now: Their child items reference DB readers that
   are going to be destroyed.

Task-number: QTBUG-18829
Change-Id: Id9cc4ea99c43c36ad5c5d1f04157a68bac79d44a
Reviewed-by: Karsten Heimrich <karsten.heimrich@digia.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/assistant/help/qhelpenginecore.cpp b/src/assistant/help/qhelpenginecore.cpp
index a2aeb73ed..3d5ba60a1 100644
--- a/src/assistant/help/qhelpenginecore.cpp
+++ b/src/assistant/help/qhelpenginecore.cpp
@@ -79,6 +79,7 @@ QHelpEngineCorePrivate::~QHelpEngineCorePrivate()
 
 void QHelpEngineCorePrivate::clearMaps()
 {
+    emit q->readersAboutToBeInvalidated();
     QMap<QString, QHelpDBReader*>::iterator it = readerMap.begin();
     while (it != readerMap.end()) {
         delete it.value();